Double blow method and press for producing tubular rivets

Details Double blow method and press for producing tubular rivets Double blow method and press for producing tubular rivets

1980-05-21

1983-01-04

Rosenbaum, Mark

10 27R, 10 27E, B21K 160

Patent

active

043665888

ABSTRACT:
A double blow method and press for producing tubular rivets is involved with a fixed die, a preparation and a finishing punch and a bore-forming pin. During the first blow the pin is positioned in the die bore in a first position, the preparation punch inserts a pre-cut wire-piece partially in the die bore and forms a crude head on the wire-piece, than the pin is moved to a second position to produce a partial bore in the wire-piece. During the second blow the finishing punch produces the final deformation of the rivet head and the pin moves in a third more advanced position to extend the bore in the rivet shank until it passes beyond its head.

REFERENCES:
patent: 2586336 (1952-02-01), Huck
patent: 3720968 (1973-03-01), Garlasch
patent: 4136417 (1979-01-01), Dahmen et al.

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